rayfield



C. L. RAYFIELD.

CAHBURETER.

APPLICATION mu) sum 15. ms.

1,354,686. Patented Oct. 5, 1920.

3 SHEEN ShEl'lT I. 21 Z C, L. RAYHELD.

CARBUHETER. APPHCATION FILED SEPT. 15. ISIS. 1,354,686, Patented Oct. 5,1920.

3 SHEETS-SHEET 2. m N Y (I. L. RAYFIELD.

CARBUHETER.

APPLICATION HLEIJ $EPT. i5. IEHG.

. 1 3 54 Patented Oct. 5, 1920.

3 SHEETS-SHE! 3.

MME WQEJE UNITED sures PATENT OFFICE.

CHARLES L. RAYFIELD. OF CHICAGO, ILLINOIS. ASSIGNOR TD FINDEISEN & KROPFMANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLI-NOIS.

CARBURETER.

Specification of Letters Patent.

Patented Oct. 5, 1920.

To all whom it may conccrn:

Be it known that l, (imam-2s l1. Barnum, a citizen of the VnitedHtates,a1ul a resident of the city of Chicago. in the county of (k 5 andState of Illinois. have invented certain new and useful Improvements in(arboreters; and I do hereby declare that the following is a full,clear. and exact description of the same, reference being had to theaccompanying drawings. and to the numerals of reference marked thereon,which form a part of this specification.

This invention relates to that type of carbureters wherein a fuel dashpot chamber is provided on the carbureter with a piston therein movableby the air inlet valve of the carbureter to steady the movement of theair inlet valve and further servin to provide a means of introduction ofuel from the dash pot chamber to carburet the air flowing past the airinlet valve to intermix with the air and fuel entering other parts ofthe carbureter as well as from a primary nozzle therein. i

It is an object therefore. of this invention "to construct a carburetorwherein the dash ot chamber thereof communicating with the float feedchamber of the carburetor. is provided with a piston actuatable by theautomatic air inlet valve-of the carburetor serving to effect a passageof fuel upwardly through the stem ofi ithe air valve. and piston fordistribution at the peripher of the air valve into the current of airflowing there past.

It is also an'object of this invention to construct a carbureter whereinan automatic air valve operating to move a piston in a fuel dash potchamber is provided with a fixed metering pin provided on the interiorof the stem so disposed that the continued movement of the air valvepiston and stem serves to increase the area of opening past saidmetering pin for flow of fuel upwardly for distribution at the peripheryof the air valve into the current of entering air.

It is also an object of this invention to construct a carburcter whereinan automatic air inlet valve is provided having fuel o rifices disposedin the periphery of theair valve to introduce fuel into the entering airat the point of greatest velocity thereof to insure inter-minglingthereof with the air flowing past said air valve.

It is furthermore an object of this invention to provide an improved airvalve and auxiliary fuel supply means for a carbureter whereby fuel,under sudden draft through the carbureter. is forced under pressureupwardly for distribution through and at the periphery of the air valveat the point of greatest velocity of the entering air and in quantitiesdependent upon the extent of opening of the air valve.

It is finally an object of this invention to construct an improved typeof auxiliary air inlet and secondary fuel supply means for a carbnreter,wherein a fixed metering pin is utilized in connection with a movableseat or nozzle mechanism operated by the auxiliary air valve of thecarbureter.

The invention (in a preferred form) is illustrated in the drawings andhereinafter more fully described.

In the drawings:

Figure. 1 is. an elevation of one side of a carbureter embodying theprinciples of my invention.

Fig. 2 is an elevation of the other side thereof.

Fig. 3 is a central vertical section taken through the carbureter withparts in elcvation.

Fig. 4 is a central vertical section taken through one end of thecarbureter with parts in another position of adjustment from that shownin Fig. 3.

Fig. 5 is a detail section taken on line .-5 of Fig. 4.

Fig. (3 is a detail section taken on line G6 of Fig. 4.

Fig. 7 is a bottom plan view of the. piston in the dash pot chamber.

As shown in the drawings:

The carburetor casing embraces a float chamber l. having formedintegrally therewith a mixing chamber 2. and said lloat chamber 1. isprovided with an extension chamber 3. connuunicating with the mixingchamber .2. and having a normally open air port 5, therein. and with afuel nozzle (1. threaded into the partition wall between the fuelchamber extension 3. and the air pas sage 4. for flow of fueltl'iereinto. A float T. is mounted within the float chamber 1. operatingin a usual manner to control the inlet of fuel to the float chamber. thesupply line for the carbiu'eter being denoted by the reference numeral9. A throttle valve 9. is provided to control the outlet from the mixing chmnhrr 2 and is mounted upon :1 shaft 10, on whirh u lever ii, ontho vxtvrior of the rnrlmrrtor is ronnectnd for operating the throttlevnlve. A needle valve 12, is provided to ('ontrol the flow through thenozzle (L and is adapted to be elevated by a finger 13. secured in ashaft 14, journulod horizontally of the ciirlmroter rnsing and providedon its outer end with a crank 1!, one end of whirh is disposed adjacentthe throttle valve shaft. 10. in position to he rontiu'trd by a ram 16,thereon whereby the (Hulk is operated to rotate the shaft 14, and adjusttho needle vulvr l2. ilowrvor, since this interronnortion hetwern thethrottle valve 9, and the neodlo valve 12, is {L wail known mrrhunism in(flllflliiliBli-h whirh I huve invented and patented heratofore, a.detailed desrription then-of is not entered into, slow this forms nopart of the present invention.

Horurvd upon tho nuiin rurbnreter casing adopted to afford an inlet intho side of the mixing rhnmher 2. is a. raising 17, having: an uir inlrtpussago 1 lhrrrthrough and u dosh pot vluunhor i9, formed on the lowermid thi'rrof closrd by u thrvudcd ('lUSlll'l plug 20. An lfllet passngi-21, for furl is proridvd in one side wail of the dash poiv rhnmhvr in,and u pipr .22. is: ronnorti-d into suid passing:- 21, and loads toiluflout i-l'mmher oxtonsion 3. of tho wirhurrii-r.

Thrrudi-d illljifiliil ly into lhiopprr oprn 0nd of the 'iihilifl' i7,is on nnuuhir vnlw nrui mvmhvr 531i, and an upwardly dirortod tubulnr(Xll'flhlflll 2 is providod on tho lop Willi of the dash pot rhnnihrrif! mnnnunirnliog with tho interior of lhv dosh pot i-luunlwr throughwhirh u inhnlur ruin sir": 25. sliduhl oxtrnds with u vulvr 2H. srrurodupon {inupprr rnd lhrrvol iuhzplrd to shut, ngninnl said annular vnlroHlill. Vision 21'. having uprrtnrrs L H ilu-rr-lhrough. i\ ranrurrd uponlhilll\\'i'l' Mid iil' lho oil-1n '35, und i inoruhhwilhin [hr dimh olrlnnnlmr l9. and a flat \nlw or dish Q11, is snonm'ird on tho oilwr iduof mid pi 'ion :uinpl'i-d during downward mm'rnn-ni of [hr pision to('lHSB the possum-s 2H. ihrrrthrough and in opou during: upward uuwrnwulof inr pision to permit possum of tho furl from the iipprr portion ollho diwh pot. rimmhrr in {Inlowi'r portion ihrrvol' to pound alillilplu'il iirvly c uirk roiurn i' the pision {o nornnd.

High ly srz-urod hy ihrondvd vngnigi-me-ni with the rlosnrl' 2H. of thodirdi pot rhnmln'r 1i and projrrting upward! in ii long: tnprrndnn-toring pin PM fl'lil"ll vxivndn into the tnhulnr 'i'uivo stmn 351iund sown-d will! in the lowrr rod of fluid sirnu is a short slrovo orcylindri' 3i. whirl: (om-tn wiih tho i fixed meivrin r )in to HUY tho:arru ol' the annular oprning through suid HlilVl' or i-yllnderdependent upon its pmilion of udjusi mom with rrspri'tto the nu-lrriurpin which is drlorminml by tho position of tho nir 'vuln- 20. and thopiston 27, in lhidosh pot rlninihvr. The upper ond of ihv iuhulnr \nlvoStem 25, is providrd with upi-rturrs whirh rommuniriitr with passages32, formed horizonlaliv through llll iowor portion of the air vnlvr 21;.

A roniral'dvflurting shirld or rowr 3th so nnrrd upon the upper and ofthe air valve 26, extends down \vnrdly and is spin-0d away from the rndsof tho pussngrs 32. oprning through tho suri'urv of tho valve to deiivrti the air thrrufroin and indurian nspirntion ell'ert through saidpossngrs to angmrnf Eluflow of fuel tlu'rrtl'irough rrrrivrd upwurdlythrough the tuhuhir strm from the dash pot rhamher. Hm'urrd hononihthrnir ruins 26. is a tubular un-nihi-r Ill. having integral therewith ulong yololrrrr 3.3, n'hirh i-xtends inwardly through 1hr uir inlotpussngr 18, into llumixing: rhurnhvr '2. and is oonnrrlrd to oiu- 0nd ofa: link 3o, ilu' opposiio 0nd of HM" iink llllll'f piroiully rounrrti-dwith n hullrrlly value 3?. to vontrol tho 0 wuing in tho loo'vr ond oi'the mining! (hum ](I' .2. is disposrd around llushun of the riglrr "Jilhearing upwardly hrni-iilh suid \ulvolo not molly lhrusl [ho sumo into('lnsid ponilioir.

The opi-rution is no follows.

.\ l'oiliul roinprrssinn spring $8 I The air Volvo 26. in tho posilionsh wn in Fig. 3, is ill normal or in rlosrd posu ion, nun

the urru of pumzuzr nronnd tlag lulioimrv motoring pin Ill). throughllll slvww or ry indrr-ll, i'or luv! from tho dosh potrhnuihor llll?into tho iuhuhir vulush m .25, in at n niinifl nnun. lhuto ilit' furlthat n How of air min-s pluro post this outi-r ond of tho pa sages 31:.and don also to tho fin"! {hut tho Sumo urn dinposml ronsddrruhl} alowliln' nornuil lorrl ol' furl in tho llnul rluinihi-r. no How of furlis disrhurgwl Maori-through \Vhvu llw ihioiih' Volvo U. is mow-i{oi-Yard open position, in uriion draft z-x rlmi,

through the rurluirrtm' whivh on lit'WHlfllli! suliirirnt io orrri'onwlhv nil-r of lliv spring: Jl-fl pium the air vuiw Lii. tho urning lhrslrrw or oi'lindrr Ill iin\\"2":il!ii around [hr lupi-rod stationarynil-Irvin pin 3H to inorrnsr tho arm] of pow ow for onlrunuof furliI|H\'lli'|ll throu h 1hr inholnr \"nirr shun :3 Willi sullirivnidrprrs-iion of lhv HllVl' :26. and millirii-ni How of air round 1hrporipln'ry of said lulu into the nil inlri pusmgr I of tho rurluirotrr.furl will hr drawn :1 iwurdly ihrough tlutubular stmn 25, andilisrhurgrd lhrough {he pussng'rs ;lof the uir vuivo into llw rapidlymoving: ourri-nt of air. The air \lllH' .43. no it inovrs dowmrurdlyPause-n llw pinion to more downwardly within lhr fifldl pol if. openingllupossum mound [ho stationary motor" ing: pin Ill). and ruining: u lionof l'ui-l undPr pri-ssurr from hvnmuh iliis pi lon lo kiloplace upwardlylhrrulnh th lulmlnr nil-m till 25. and sprayed outwardly through thepassages 32. provided in the air valve .26. A flat or eheek valve 2!).provided on the under side of the piston 27, serves to (lose the passages through said piston during (lOWH' ward movement of the piston butdrops downwardly to permit a tlow oi fluid downwardly theretbrough asthe piston moves upwardly in the dash pot, so that passage of fuel maytake place from the upper portion of the dash pot to the lower port-ionthereof beneath the piston to permit a quick return of the piston tonormal.

I am aware that; various details of construction may be varied through awide range without departing: from the principles of this invention, andI therefore do not purpose limiting the patent granted otherwise thanneeessitated by the prior art.

I rlaim as my invention:

1. In a earhnreter of the class described, an autoniatie air valve, adash pot chamber, a piston therein operated b said air valve, a tubularvalve stem ailort int: eonnections between said air valve and piston, astationary metering; pin mounted within said tuhw lax valve stem wherebythe quantity of flow from the dash pot chamber to the piston is variedaerordingz to the adjustment of the .\ili|) on the metering pin,passages formed through the air valve eommunieatiup with the tubularstem, whereby the fuel from the dash pol ehamher, may be sprayed intothe air entering the earhureter an means de fleeting the air i'romthet'nel passages.

2 in a arlnneler ol the class described a Iioat. feed chamber, anautomatic air valve, a dash pot rlnimber, rommunieation between saidilont feed ehamber and the upper end of will dash pol ehnnilu-r, apiston in said dash pot rhumber :i tubular valve stem secured theretoand ronnnnnieating centrally theretbrough. n lived metering pin mountedin Hlill lash pot rhamb r and extending upwardly within said tubularvalve stem, at vim-it valve asso iated with said piston to resist \lH'downward movement of the piston. whereby the l'uel is r mpressedtherebeneath and l'orved npwardr through said valve rliill. and pmsagesthrough said air valve to |'tl'il\(' the fuel from the tubular valvestem, tel 4'21 rluirel the air entering the earbnreter.

More a fuel nozzle therefor. a dash pot ehamlimvommnnieatinn with theiloat chamber, an automntir air valve having passages ahoiiits sentrommunieating with the dash pol rhamber. a piston movable with the airWire to pump l'uel through the passages. a :Jaiionnnv nieterinp pin l'orregnlutitu: the amount o! l'uel pumped through said pussan'es and ndellm'tor l'or doth-(ting the air iron: the passages in imbue anaspiration ril'eri through v aid passage-n.

i. la a rarhnieter :i dash pol 'ii;Ei!Ei'nji' t eontaining fuel, apiston therein, an air valve having radially opening apertures, a hollowstem connecting the air valve and piston and affording communicationbetween the radial apertures and the clash pot below tbe piston. atniered metering pin rigidly mounted in the clash pot and extendingupwardly into the stem. a sleeve secured in the stem, enacting with themetering pin to regulate the flow of fuel through the stem and a springfor automatically forcing the air valve closed.

5. A carbureter comprising a. float feed chamber, a dash pot chambercommunicating therewith, a piston in the dash pot chamber havingopenings therethrough, an air valve. provided with fuel passagetherethrough, a hollow stem connecting the air valve and piston andaffording communication between the dash pot and fuel )assages, ametering pin extending into t e stem, means in the stem coacting withthe metering pin to vary the quantity of fuel delivered to the fuelpassages. a dirk secured to the piston adapted to close over the holesthe ein as the piston moves downwardly to thereby force the t'nel up thestem and adapted to uncover the holes when the piston moves oppositelyto permit the fuel passing: therethrough for a quick return of thepiston and a spring for normally holding the air valve closed.

6. A carburetor comprising a float chamber, a. dash pot chamberoommunieating therewith, an air inlet, a valve for closing the sameprovided with laterally openin passages, a stem seeured to the valve anconminnirating with the passages and the dash poL a piston movable withthe stem adapted to pump fuel therethrongh, a me tering pin projeetinginto the stem. :1 spnng for normally holding the valve seated and adetleetor secured to the valve for deflecting the air from thedist-barge ends of the pussages.

T. in n rnrlnlreter the eonibinntion with a easing havinp a mixingehamber and float; feed means for rontrollinp the supply of fuel to theearburetor, olnn automatic a r valve rontrollinp the admission of :1'1'i; the mixing chamber. a fuel pump operated by the air valve and havingan outlet for supplying: fuel to the mixing, eharnher through whieh saidoutlet fuel is forced by the pump when the air valve is opened, and

a manually adjustable metering pin for said outlet. for regulating thedist-barge therefrom 1n-o mrtionalely to the opening: of the air valve.

F in a earbureter the romhination of a casing having a mixing eh'amberand tloat feedmeans l'or eontrolling the supply of fuel to therarbureter. of an automatic air valve l'i controlling: the admission ol'air to the mixing ehamber, a fuel pump operhv the mm 3 when the airvalve is o ened and a stationary metering pin for said outlet forregulating the dist-large therefrom proportionetely to the opening ofthe air valve.

3 In a rarbureter, the combination with a easing having ainixingrluunber and float feed means for controlling the supply of fuel to therarbureter, of an automatic air valve for controlling the admission ofair to the mixing vhainber, a fuel pump having a hollow stein vonnertedwith the air valve and provided with outlets from the hollow stemthrough which fuel is forced by the pump when the air valve is opened,and a metering pin projecting into the hollow stein for regulating thedischarge from said outlet. proportionately to the opening of the airvalve.

10. In a rarbureter the combination with a casing having a mixingchamber and a float feed. vhamber for controlling the supply of fuel tothe carburetor, of an automatic air valve for controlling the admissionof air to the mixing chamber, a piston operable with the air valve andhaving an inelosing cylinder with an outlet at one side of the pistonthrough Wlllt'll fuel is forced by the piston to the mixing chamber whenthe valve is opened, a duct for supplying fuel from the float feedchamber to the cylinder at the other side of the piston, and a passagethrough the piston having a, valve ada )ted to close when the piston isoperated to orce fuel through said outlet from the cylinder and adaptedto open when the piston operates in the revelse direction and admitfnebthrough the passage of the piston to till the outlet side of thecylinder.

1n testimony whereof I have hereunto subscribed my na'me'in the presenceof two subscribing witnesses.

CHARLES L. RAYFIELD. Witnesses (sI-IARLBS W. HILL, J12, EARL M. HARDINE.

